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That is super strange! This sounds like an error that is thrown up when the phone does not have a cellular connection. Do you happen to notice how many bars of signal your phones show when you attempt to make the call?

I'm just checking in to see if you had a chance to try the steps that tmo_chris mentioned. That is pretty much the only option that I can come up with as well. While this is happening on two of your LG Aristo's, I haven't seen other reports of this.